HD 12055

HD 12055
Location of HD 12055 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension 01h 57m 10.08491s[1]
Declination −47° 23′ 07.0936″[1]
Apparent magnitude (V) 4.82[2]
Characteristics
Spectral type G6III-IIIb[3]
U−B color index +0.51[4]
B−V color index +0.88[4]
Astrometry
Radial velocity (Rv)+13.36±0.22[1] km/s
Proper motion (μ) RA: +102.213[1] mas/yr
Dec.: +16.301[1] mas/yr
Parallax (π)13.1010 ± 0.2295 mas[1]
Distance249 ± 4 ly
(76 ± 1 pc)
Absolute magnitude (MV)0.42[2]
Details
Mass2.39[5] M☉
Radius10.40+0.46
−0.70[1] R☉
Luminosity71.1±1.4[1] L☉
Surface gravity (log g)3.04[6] cgs
Temperature5,196+185
−112[1] K
Metallicity [Fe/H]–0.02[6] dex
Rotational velocity (v sin i)5.7±1.0[7] km/s
Age1.08[5] Gyr
Other designations
CD−47°597, GC 2369, HD 12055, HIP 9095, HR 574, SAO 215715[8]
Database references
SIMBADdata

HD 12055 is a candidate astrometric binary[9] star system in the southern constellation of Phoenix, near the eastern constellation border with Eridanus. It is yellow in hue and is visible to the naked eye with an apparent visual magnitude of 4.82.[2] The system is located at a distance of approximately 249 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +13 km/s.[1]

The visible component is an aging giant star with a stellar classification of G6III-IIIb.[3] With the supply of hydrogen at its core exhausted, the star has cooled and expanded off the main sequence – at present it has ten[1] times the girth of the Sun. It is around a billion[5] years old with 2.4[5] times the mass of the Sun and is spinning with a projected rotational velocity of 6 km/s.[7] The star is radiating 71 times the luminosity of the Sun from its photosphere at an effective temperature of 5,196 K.[1]

This system is the most likely source of X-ray emission coming from these coordinates.[10]

  1. ^ a b c d e f g h i j k l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference XHIP was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mallama2014 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Alves2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference deMedeiros2014 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Haakonsen2009 was invoked but never defined (see the help page).